<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>es6</title>
</head>

<body>
</body>

</html>
<script>
    let p = new Promise((resolve, reject) => {
        //   resolve('成功了')
        reject('失败了')
    })
    p.then((res) => {
        console.log(res)
    }, (err) => {
        console.log(err)
    })
</script>